<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>边框样式演示</title>
    <style>
        #d1{
            /*border: 5px solid red;*/
            border-top: 5px solid blueviolet;
            border-left: 5px double red;
            border-right: 5px dotted coral;
            border-bottom: 5px dashed mediumspringgreen;

            width: 150px;
            height: 150px;
        }
        #d2{
            border: 5px solid red;
            border-radius: 25px;

            width: 150px;
            height: 150px;
        }
    </style>
</head>
<body>
<div id="d1"></div>
<br/>
<div id="d2"></div>
</body>
</html>